Jangerberries are also used in the Watchtower quest and can be randomly selected as an item needed in the quest Fairytale I - Growing Pains. If you do get this item for the Fairytale quest, it would be advisable to bring 4 or more (or simply bring Druid pouches), because the ghasts in Mort Myre Swamp may turn it into rotten food. This makes it useless, and may result in you doing more running than necessary if it happens.

There are four spawns on a small Ogre island in a lake west of Yanille. This island requires that you take a rope each time you want to get onto it; use the rope on the branch of the long branched tree located west of the island. A mithril grapple will not work in place of a rope. Alternatively, you can use telekinetic grab to transfer the berries to your inventory.

Jangerberries can also be grown using jangerberry seeds with level 48 Farming. A player can pay the farmer 6 watermelons to look after the bush. When planted, players will receive 50 experience and 285 experience for checking the bush's health. Players will then get 19 experience for harvesting each jangerberry, equalling a total of 76 experience for harvesting a fully grown jangerberry Bush.

Jangerberries are the only berry type that uses the standard "berry" image that are edible on their own. Dwellberries and strawberries are also edible on their own, but have a different inventory image.